215440431109 has 2 divisors, whose sum is σ = 215440431110. Its totient is φ = 215440431108.

The previous prime is 215440431097. The next prime is 215440431221. The reversal of 215440431109 is 901134044512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133846222500 + 81594208609 = 365850^2 + 285647^2 .

It is a cyclic number.

It is not a de Polignac number, because 215440431109 - 2⁷ = 215440430981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215440434109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107720215554 + 107720215555.

It is an arithmetic number, because the mean of its divisors is an integer number (107720215555).

Almost surely, 2^215440431109 is an apocalyptic number.

It is an amenable number.

215440431109 is a deficient number, since it is larger than the sum of its proper divisors (1).

215440431109 is an equidigital number, since it uses as much as digits as its factorization.

215440431109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 215440431109 in words is "two hundred fifteen billion, four hundred forty million, four hundred thirty-one thousand, one hundred nine".